diff --git a/rulesets/java-sheepit.xml b/rulesets/java-sheepit.xml
index b2b2ac6..631f488 100644
--- a/rulesets/java-sheepit.xml
+++ b/rulesets/java-sheepit.xml
@@ -49,6 +49,8 @@
 	<rule ref="category/java/errorprone.xml/UnnecessaryConversionTemporary" />
 	<rule ref="category/java/errorprone.xml/UnusedNullCheckInEquals" />
 	<rule ref="category/java/errorprone.xml/UselessOperationOnImmutable" />
+	<rule ref="category/java/errorprone.xml/UnnecessaryBooleanAssertion" />
+	<rule ref="category/java/errorprone.xml/UnnecessaryCaseChange" />
 	<rule ref="category/java/multithreading.xml/AvoidThreadGroup" />
 	<rule ref="category/java/multithreading.xml/DontCallThreadRun" />
 	<rule ref="category/java/multithreading.xml/DoubleCheckedLocking" />
diff --git a/src/main/java/com/sheepit/client/standalone/Worker.java b/src/main/java/com/sheepit/client/standalone/Worker.java
index 77e6c29..18ce973 100644
--- a/src/main/java/com/sheepit/client/standalone/Worker.java
+++ b/src/main/java/com/sheepit/client/standalone/Worker.java
@@ -406,7 +406,7 @@ public class Worker {
 			}
 			
 			if (shutdownMode != null) {
-				if (shutdownMode.toLowerCase().equals("wait") || shutdownMode.toLowerCase().equals("hard")) {
+				if (shutdownMode.equalsIgnoreCase("wait") || shutdownMode.equalsIgnoreCase("hard")) {
 					config.setShutdownMode(shutdownMode.toLowerCase());
 				}
 				else {